Is Morph compatible with Custom NPCs in 1.12? Beacuse when I transform into a custom NPC and start to move... I JUST CAN'T STOP

I mean... I actually can stop, but only by hitting a wall :P

It's something that I need to set in the NPC or it's just incompatibility?

Edit: I just tested, and it only happen with Pixelmons. Other Custom NPCs don't cause this glitch

As Morph has just been rewritten and released for MC 1.16.5, I am clearing the issue tracker as I have not provided any support Morph for 1.12.2 and earlier. My apologies for not addressing your issue.